A mother says her autistic son cannot get to school because his taxi transport has been withdrawn.

The woman, who does not wish to be named publicly, says she was given two days' notice at the start of the school year that her 13-year-old son would be transported by a different taxi driver.

She said her son's behaviour worsened because of the change of driver and it prompted the South Australian Education Department to withdraw the service this month.

The mother said she was now expected to transport her son to and from his special school at Murray Bridge, which is 75 kilometres from their home.

"That's very impractical considering the distance involved and having to do four round trips is about 300 kilometres and [officials] told me basically they were going to pay me $60 a day for the four trips," she said.

"This doesn't take into consideration my car my time, the fact that I've got other children, I'm sorry."

South Australian Education Minister Jennifer Rankine said her department was trying to remedy the situation.

"The problem has been that the transport company has withdrawn services so we need to find a company that is prepared to transport him but, as I understand it, there was some funding offered to the mother to compensate her if she took up the option of driving him to school herself," she said.